Esolang written upon an 8 track tape. Programs either loop implicitly or through the use of a metal strip on the tape, move down one program.
A program is written using a number of one-character codes, and a cartridge can contain up to 8 programs. Each program can switch between programs on the cartridge, in addition to being able to modify the contents of each tape, run different operations, and manipulate a 8-element stack.
This implementation also provides "cheats" to allow cartridges of more than 8 programs and with a stack larger than 8 elements.
This project also experiments with using an APL-like programming style in rust. For an example of this programming style, see the J Incunabulum.